689971099 has 2 divisors, whose sum is σ = 689971100. Its totient is φ = 689971098.

The previous prime is 689971081. The next prime is 689971109. The reversal of 689971099 is 990179986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689971099 - 2⁹ = 689970587 is a prime.

It is not a weakly prime, because it can be changed into another prime (689971019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344985549 + 344985550.

It is an arithmetic number, because the mean of its divisors is an integer number (344985550).

Almost surely, 2^689971099 is an apocalyptic number.

689971099 is a deficient number, since it is larger than the sum of its proper divisors (1).

689971099 is an equidigital number, since it uses as much as digits as its factorization.

689971099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2204496, while the sum is 58.

The square root of 689971099 is about 26267.3009462335. The cubic root of 689971099 is about 883.6432546139.

The spelling of 689971099 in words is "six hundred eighty-nine million, nine hundred seventy-one thousand, ninety-nine".